Straight pipe all the way through. The only thing I can think of so far would be the vgt actuator is not opening up the vanes enough. The delta between my ebp actual and ebp desired is the farthest apart at idle. I do think I have a slight exhaust leak on the driver side manifold but I don't see how that would cause excessive back pressure.
The issue came about around early April. I think it's possible they could be slightly off from the mods. But they're not slightly off, they're way off. They rise and fall proportionally though. WOT I can hit 1600 degrees easy but just driving around they are not much different than stock. Cruising at 75-80 on the highway they will stay between 600-750.
Haven't monitored map. There a few things I'm going to check out when I get some spare time. I don't think anything is wrong with the turbo because I don't have any problems when I have a working ebp sensor. I know the sensor is shot because its throwing an ebp circuit A code. It's the same code that I have had ever time. Not sure if you have ever looked at one up close but on the side that goes into the tube that connects to the manifold, there is a white screen looking thing. Whenever they go bad, from my experience at least, there's so much back pressure that it pushes the screen up into the sensor or something along those lines because it's gone when I swap the sensors out. I guess over time the excess pressure weakens it.
i have -03 model so i belive i have a different sensor or atleast it is located different place, when i did HG's job to my truck i did clean the sensor and it was near complete clogged and the adapter plus the line was glogged as well. didn't see any screen what i can remember.
I can't remember exactly I'll have to monitor it again. I wanna say like 60+.
